Q3 of 53 Page 166

Foctorise the following:

x2 + 4x – 21

⇒ x2 + 4x – 21


⇒ x2 + 7x - 3x – 21


⇒ x(x + 7) – 3(x + 7)


⇒ (x + 7)(x – 3)


More from this chapter

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3

Foctorise the following:

x2 + x – 12

 3

Foctorise the following:

x2 – 3x – 18

 3

Foctorise the following:

x2 – 4x – 192

 3

Foctorise the following:

x4 – 5x2 + 4